D♯0 / E♭0
19.445Hz at concert pitch
Press to hear a pure sine tone at this pitch.
MIDI note
15
Piano key
—
Octave
0
Frequency
19.445 Hz
Period
51.4271 ms
Wavelength
17.6395 m
Pitch class
D♯
Notation
SPN
MIDI is the note number synths and software pass around (0–127). Pitch class is the note without its octave — all the D♯s share one. Enharmonic spellings (D♯0 and E♭0) name the same pitch two ways. This note falls outside the 88-key piano, so it has no piano key number.
At other reference pitches
| Reference (A4) | D♯0 frequency | Where you meet it |
|---|---|---|
| 432 Hz | 19.092 Hz | the alternative-tuning circle |
| 440 Hzstandard | 19.445 Hz | the ISO 16 standard — concert pitch |
| 442 Hz | 19.534 Hz | many European orchestras tune a touch sharp |
| 443 Hz | 19.578 Hz | some sharper continental orchestras |
Every row is D♯0 — only the A4 you tune to changes. A frequency scales straight with the reference: D♯0 at 432 Hz is the 440 Hz value times 432⁄440.
Move around
Every D♯
Chords with D♯ in them
D♯ appears in each of these — see the whole chord grid.